CVE-2026-66340 in Mira
Summary
by MITRE • 08/12/2026
The Mira cloud authentication endpoints do not enforce per-account rate limiting, per-IP throttling, or account lockout after repeated failed login attempts. An attacker can use brute-force methods to obtain gain access to user accounts.
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Analysis
by VulDB Data Team • 08/17/2026
The vulnerability described involves a critical deficiency in the security controls of the Mira cloud authentication endpoints, specifically regarding the enforcement of rate limiting and account protection mechanisms. In modern web application architecture, robust authentication systems must implement multiple layers of defense against automated attacks. The absence of per-account rate limiting means that there is no restriction on the number of login attempts allowed for a specific user identity within a given timeframe. Similarly, the lack of per-IP throttling indicates that requests originating from a single source address are not subject to frequency caps or delays. Furthermore, the system fails to implement account lockout policies after repeated failed authentication attempts, which is a standard countermeasure designed to mitigate automated credential stuffing and brute-force attacks. This combination of missing controls creates an environment where attackers can systematically guess valid credentials without encountering resistance from the application logic.
From a technical perspective, this flaw represents a failure in implementing adequate input validation and session management safeguards as defined by industry standards. The vulnerability aligns closely with CWE-307, which describes Improper Restriction of Excessive Authentication Attempts. This classification highlights that the system does not adequately limit or restrict authentication attempts, allowing an adversary to perform brute-force attacks against user accounts. Additionally, this behavior is consistent with MITRE ATT&CK technique T1110, specifically sub-technique T1110.001 for Brute Force: Password Guessing and T1110.003 for Brute Force: Credential Stuffing if the attacker utilizes leaked credential databases. The lack of these controls means that automated scripts can iterate through large volumes of potential passwords or usernames with minimal latency, significantly reducing the time required to compromise an account compared to a properly secured system where delays and locks would impede such operations.
The operational impact of this vulnerability is severe, as it directly compromises the confidentiality and integrity of user accounts hosted on the Mira cloud platform. An attacker leveraging these weaknesses can gain unauthorized access to sensitive data associated with individual users, potentially leading to identity theft, financial fraud, or further lateral movement within connected systems if those credentials are reused elsewhere. For organizations relying on this service, such a breach could result in significant reputational damage and regulatory penalties under frameworks like GDPR or HIPAA due to the exposure of personally identifiable information. The ease with which an attacker can bypass authentication controls means that even strong passwords may eventually be compromised through persistent automated guessing, especially if users employ common phrases or predictable patterns.
To mitigate this vulnerability, immediate remediation steps must focus on implementing comprehensive rate limiting and account protection strategies at both the application layer and infrastructure level. Developers should enforce strict per-account rate limits that temporarily lock an account after a defined number of consecutive failed login attempts, typically between five to ten failures depending on organizational policy. Concurrently, IP-based throttling mechanisms should be deployed to limit the frequency of authentication requests from any single source address, employing exponential backoff delays for repeated offenders. It is also advisable to integrate multi-factor authentication (MFA) as an additional layer of security that remains effective even if passwords are compromised through brute-force methods. Furthermore, implementing CAPTCHA challenges after a few failed attempts can help distinguish between human users and automated bots without significantly degrading the user experience for legitimate customers. Regular monitoring and alerting on anomalous login patterns will also aid in detecting ongoing attacks early, allowing security teams to respond proactively before accounts are successfully compromised.